砲ほう門もん

noun

gunport; embrasure; muzzle

Refers to an opening in a fortification or ship's side through which a cannon is fired, or the muzzle end of a gun. A technical military term.

• 城じょう壁へきの砲ほう門もんから大たい砲ほうが顔かおをのぞかせていた。